I'm building the robot for which i'm using the Tamiya Twin Gear Box Set http://www.superdroidrobots.com/shop/item.aspx?itemid=408 which uses the FA-130 Tamiya Mabuchi Motor's of 6 VDC intake @ 0.66 A and to control their direction i'm using a L293DNE H-Bridge which has a limit of 1 Ampere and thus two motor's will take about 1.2 Ampere's that i think will atleast burnout the H-Bridge.
@What can i do to prevent this happening?
Not quite sure what you are asking? The real answer is to use two h bridges as you don't want to run anything at it's limit, let alone above it. But you could add some resistors to reduce motor current.
Mike,
Could the 2 drivers in the L293D be run in parallel for 1 motor?
Or does that introduce a current sharing mess?
As it is so close to the limit I suppose that might work, but then he is still left to control one motor per bridge.
L293D has output current of 600mA and peak output current of 1.2A per channel. Moreover for protection of circuit from back EMF ouput diodes are included within the IC.
Written at this site,DC Motor Interfacing with Microcontroller tutorial
I think if this is Right i can connect my both Motor's in it? ,What you think?
Peak output current, IO (nonrepetitive, t ? 100 ?s): L293D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1.2 A
Continuous output current, IO: L293D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±600 mA
Basic specifications for the motor from pololu.com:
•Operating voltage: 1.5-3 V <<-- BUSTED
•No-load speed at 3 V: about 12,300 RPM
•Stall current at 3 V: about 2.10 A <<-- BUSTED
•Stall torque at 3 V: about 36 g-cm
For more information, please see model FA-130RA-18100 in the FA-130RA data sheet (58k pdf).
This motor is intended for 3 V operation; running it at higher voltages will shorten its lifetime. <<-- BUSTED
Not too sure this is the combination of parts you want Nishant.
Robert
Even these would be marginal - the slightest stall/motor jam and the L293D is a goner:
Here's the driver chip they use
TB6612FNG data sheet http://www.pololu.com/file/download/TB6612FNG.pdf?file_id=0J86
Have not done any motor work myself, just going by what the specs are telling me.
I agree that the L293 would be marginal for these motors. Better to upgrade to something like an L298 and give yourself some headroom. The little Pololu board looks like a very cost effective and easy solution though.